Operation, Monitoring and Decommissioning of Large Dams in India

Transcription

1 Contributing Paper Operation, Monitoring and Decommissioning of Large Dams in India Dr V.P. Jauhari Environment, Forests, Science & Technology Department; Andhra Pradesh State; India Prepared for Thematic Review IV.5: Operation, Monitoring and Decommissioning of Dams For further information see This is one of 126 contributing papers to the World Commission on Dams. It reflects solely the views of its authors. The views, conclusions, and recommendations are not intended to represent the views of the The views of the Commission are laid out in the Commission's final report "Dams and Development: A New Framework for Decision-Making".

2 World Commission on Dams. Disclaimer This is a working paper of the World Commission on Dams - the report herein was prepared for the Commission as part of its information gathering activity. The views, conclusions, and recommendations are not intended to represent the views of the The Commission's views, conclusions, and recommendations will be set forth in the Commission's own report. World Commission on Dams 5 th Floor, Hycastle House 58 Loop Street PO Box Vlaeberg, Cape Town 8018, SOUTH AFRICA Telephone: Fax: ii

3 World Commission on Dams. Content iii 1. INTRODUCTION Irrigation Strategy Irrigation Development through the Plan periods - Overview National Water Policy Dam Building Activity in India since Completion of Pending Works vs Starting New One s Private Sector Participation CONCLUSION Completion of Pending Works Vs Starting New Private Sector Participation Increase in cost of creation of irrigation potential DAM SAFETY & FUNCTIONING ROLE OF DIFFERENT VARIABLES Factors Affecting the Dam Safety: Geology and Hydrogeology Table Reported cases of Reservoir-induced seismicity greater than magnitude Table Name of reservoir Annual rate of siltation Observed Table Name of reservoir Annual rate of siltation Observed Table Depicting Sedimentation Rates in some Indian Reservoirs Name of Dam Type of catchment Table Period Year Year Table Table Electric conductance of ground water samples at Nagarjunasagar Command Area Tables 3.12 to

4 World Commission on Dams. iv Figure Causes of Dam Failures Location Type Block 9 OF Block 18 - NOF Working Working Instruments Number Table Instrument Reliability Instrument The institutional development in States to assure the safety of dams, vis-à-vis the role of World Bank was first discussed in a special meeting held at Nasik (Maharashtra) on which was attended by Members of the National Committee on Dam Safety (NCDS) and Mr. G.W. Fauss of World Bank. During the discussions, the States were told about the need for assured funding for rehabilitation of projects where deficiencies have been identified, without which the periodic inspections through the upgraded dam safety programme may not be of arty use Implementation of the Project: Centre - CWC Status of remedial works Madhya Pradesh Madhya Pradesh Gandhi Sagar Barna Dudhawa Muramsilli Barchar Maniyari Ravishankar Sagar Sondur Tawa Orissa Orissa Kangsa Bahal Kuanria Rajasthan Rajasthan Ranapratap Sagar Jawahar Sagar...107

5 World Commission on Dams. v Matrikundia Jawai Sei Diversion Tamil Nadu Kodaganar Manimuthar Pechiparai Monitoring of the financial aspects during the implementation and postimplementation stage needs adequate institutional arrangement. The Ministry of Finance, the Auditor & Comptroller General, the Planning Commission and public bodies like Public Accounts Committee of the Parliament perform the functions of financial assessment and control. International organisations like the World Bank the Asian Development Bank have an interest in the technical and financial appraisal of projects funded by them Table Year when struggle ended Scrapped Year when struggle ended Project restructured to mitigate environmental and social impacts Adequate information sought by the protesters Scrapped Scrapped Construction of the dam remains suspended though work on canals and other infrastructure continue in full speed Year when struggle ended Scrapped Struggle continues Work has started under police protection Year when struggle ended Construction Continues Outstees granted exclusive rights for fishing in the Bargi dam by terminating the existing contractor system Scrapped Total Periodicals, Magazines & Articles:

7 World Commission on Dams INTRODUCTION 1.1 Irrigation Strategy Agricultural growth is a prerequisite for the economic and social development of India. It contributes 28% of GNP, about 60% of employment and is the primary source of livelihood in rural areas, which account for 75% of India s population and 80% of its poor. The irrigated and agriculture, contributes nearly 56% of agriculture output. The increase in irrigation intensity has contributed to the growth in the overall cropping intensity (including rainfed crops) which increased from % in to % in The nature of irrigation expansion of tubewells and availability of surface water from storage type irrigation projects has enabled the production of Rabi and summer crops. Supplemental irrigation is available via run-of-the-river irrigation schemes as the snow melt. In the 1950s and 1960s, extension in cultivated area contributed substantially to increase in our foodgrain production. Mid Sixties onwards, expansion of irrigation as well as introduction of high yielding varieties of rice, wheat and other crops brought the country s foodgrain production to a satisfactory level. Further step up in foodgrain production, to the extent of its doubling in next 10 years, would mainly depend on the availability and performance efficiency of irrigation. The Ninth Plan is making a thrust in this direction through a Special Action Plan. The overall strategy of irrigation development and management during the Ninth Plan has the following core ingredients: a) Improvement of water use efficiency by progressive reduction in conveyance and application losses, b) Bridging the gap between the potential created and its utilisation by strengthening the Command Area Development Programme (CADP), institutional reforms and promoting farmers involvement in irrigation management. c) Completing all the ongoing projects, particularly those, which were started during pre-fifth and Fifth Plan period as a time bound programme to yield benefits from the investments already made. d) Restoring and modernise the old irrigation systems which were executed during the pre- Independence period and 25 years ago. e) Introducing rational pricing of irrigation water, based initially on O&M cost and then to encourage higher level of water use efficiency. f) Taking concrete steps towards comprehensive and integrated development of natural water resources, taking into account the possibility of inter-river-basin transfer of surplus water and, g) Promoting adaptive research and development to ensure more cost-effective and efficient execution and management of irrigation systems. h) Promoting Participatory Irrigation Management (PIM) with full involvement of the water user community, which will be at the centre stage of the implementation of above strategies of the Ninth Plan. i) Encouraging and implementing the conjunctive use of ground and surface waters towards optimal utilisation of water resources and to have its development environmentally sustainable as well. j) Accelerating the development and utilisation of ground water, particularly in the eastern region on sound technical, environmental and economic considerations along with proper regulatory mechanisms. 1.2 Irrigation Development through the Plan periods - Overview Irrigation is a vital input to increase agricultural output to keep pace with the food requirements of the ever-increasing population. As recently reassessed by the Ministry of Water Resources, the country s ultimate irrigation potential is tentatively estimated at m.ha. comprising of m.ha. through major & medium irrigation and m.ha. from minor irrigation as against pre-revised ultimate irrigation potential of m.ha. In the post-independence period a sum of about Rs crore (including about Rs crore of institutional investment) at the current price level (Rs.231,386.59

8 World Commission on Dams. 2 crore at constant price), has been made in major, medium and minor irrigation projects including ground water and as a result, the creation of irrigation potential increased from 22.6 million hectares(m.ha.) in the pre-independence period, to about m.ha. at the end of the Eighth Plan. With this, India has the largest irrigated area among all the countries in the world. This has greatly contributed to the increase in foodgrains production from 51 million tonnes (mt.) in to 198 mt. in at a compound annual growth rate of around 3 per cent. Broadly speaking, about 60% of the foodgrains production has come from the irrigated area which constitutes about one-third of <total cultivated area and the remaining production has come from the rainfed areas. Table-1.1 shows the magnitude and the composition of investment in irrigation and flood control projects through successive Plan periods. Table 1.1: Magnitude & Composition of Investment through Plan periods in Irrigation and Flood Control Sectors (Rs. in crore at current price level) Plans Major & Medium Irrgn. Minor Irrigation Public Sector Institutional Finance Total C.A.D. Flood control prices Total current First ( ) ( ) ( ) Neg ( ) (273.98) Second ( ) ( ) ( ) (306.24) ( ) (760.61) Third ( ) ( ) ( ) ( ) ( ) (551.28) Annual ( ) ( ) ( ) ( ) ( ) (585.02) Fourth ( ) ( ) ( ) ( ) ( ) ( ) Fifth ( ) ( ) ( ) ( ) ( ) ( ) Annual * ( ) ( ) ( ) ( ) ( ) ( ) ( ) Sixth ( ) ( ) ( ) ( ) ( ) ( ) ( ) Seventh ( ) ( ) ( ) ( ) ( ) ( ) ( ) Annual ( ) ( ) ( ) ( ) ( ) (922.01) (685.63) Eighth ( ) ( ) ( ) ( ) ( ) ( ) ( ) Total ( ) ( ) ( ) ( ) ( ) ( ) Source: Reports of the Working Groups of Ninth Five Year Plan. Upto 3/80. Note : Figures within brackets above indicate the expenditure at constant prices at ) 1.3 National Water Policy at ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) The National Water Policy (NWP) was adopted by the National Water Resources Council, headed by the Prime Minister in its meeting held on The NWP recognises water to be prime natural resource, a basic human need and a precious national asset. Therefore, planning and development of water resources need to be governed by a national perspective. The intention of the NWP was to mark

9 World Commission on Dams. 3 the territory in broad terms, so as to establish the need for a. National Water Policy, and to give a broad outline of what the policy document needs to cover. The formulation of NWP is not a one-time exercise but is to be kept constantly under review, thereby including within its purview more and more issues and areas of concern as they emerge. For a more effective operationalisation of the NWP stress would have to be placed on the following: (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) (x) (xi) (xii) Watershed management, rain water harvesting and water saving practices should be an integral part of development and management of water resources at the basin level and while formulating water resources development projects. Also, Micro irrigation systems need to be promoted particularly in arid regions where water is scarce and the topographic and soil conditions do not permit efficient irrigation by conventional methods; Drainage is to be an integral part of the irrigation system, particularly. when perennial irrigation is contemplated; The Management of irrigation systems by farmers should also cover water rights and the need for establishing and regulating them. Since water markets are expanding, there is a need to develop and enforce guidelines for their operation. During the Ninth Plan period, the pricing of water for various uses including agriculture should be rationalised in a phased manner so as to at least fishy recover the Operation and Maintenance Cost. Policy framework or guidelines on the criteria for inter-state river water allocation among the basin states should be evolved. Both demand and supply for water resources should be assessed on the basis of agroecological-irrigation zones, cropping systems and other uses within a dynamic time- frame; Conjunctive use of surface and ground water should be encouraged by making adequate energy available to farmers; The role and responsibility of various agencies and organisations involved in water resources development and utilisation should be clear]y defined Appropriate infrastructure should be developed to promote proper linkages among them; Involvement of farmers organisations, such as. Water Users Associations should be increased in respect of decisions on cropping systems, planning and implementation of water release schedules, collection of water rates, maintenance of irrigation systems, etc Assistance of voluntary agencies/ngos should be enlisted in this task. A gender dimension should be integrated in all decisions relating to water use. The new paradigm of water use management should include important parameters such as, efficiency, ecology, equity and employment in addition to economics of energy-use efficiency; in view of increasing demand for water, there is a need to augment the resource through interbasin transfers, artificial recharge of aquifers, use of marginal quality water, conjunctive use of surface and ground water, rain water harvesting in rainfed areas, watershed development, adoption of water saving practices etc. In order to ensure sustained availability of pound water, average annual withdrawal should not exceed average annual recharge. Ground water of marginal quality could be used advantageously in combination with good quality of water or for alternate irrigations.

10 World Commission on Dams. 4 (xiii) (xiv) The existing law on water quality needs to be effectively implemented for prevention of pollution of surface and ground water. Ground water pollution being more serious and hazardous, as compared to surface water pollution would require special institutions for preventing and abating pollution. The Indian Prime Minister while addressing the Nation on 22 nd March 1998 indicated that the Government would go all out to achieve five goals which include unveiling a National Water Policy so that no water goes waste and our water resources are cleaned up. Appropriate action in this regard has already been initiated.

11 World Commission on Dams Dam Building Activity in India since Completion of Pending Works vs Starting New One s Private Sector Participation India is among the foremost countries in the world in developing its water resources. The Grand Anicut in Tamil Nadu across river Kaveri dates back to second century during the Chola dynasty. Even today this anicut in its remodelled state serves as one of the most important irrigation facility to the State of Tamil Nadu. Due to favourable agro-climate, by and large the Indian economy has been traditionally based on agriculture since centuries. Agriculture contributes about one-third of GNP, and remains a key sector in the national economy. It engages two-thirds of labour force and accounts for about 18% of India s merchandise exports. In spite of the fact that this country is endowed with vast land and water resources, it is a water short country in relation to agriculture, municipal and industrial needs. About 80% of the annual rainfall and run-off are concentrated in the monsoon months. During this period maximum utilization of water can be made from the run of the river with small regulation requiring very little storage. Less than 15% of the hydropower potential has been achieved. Also only 25% of culturable area is irrigated. About 70% of river flows are discharged into the sea without utilization. The rainfall is not evenly distributed in space and time resulting in flooding in certain areas and drought conditions in certain parts of the country as seen in earlier paras. Therefore, it became necessary to store water by building large storage capacity reservoirs and storage tanks so that supplies for multiple purposes like domestic, irrigation, industries and power generation can be assured during the dry season, in addition to effecting flood control in certain rivers. Modern dam construction began during the second half of 19th century, even though they had been built since ancient times. At the turn of twentieth century (1900) there were 42 dams in India. During 1901 to 1950 about 250 dams were added. That is, at the time of the beginning of plan period ( ), after India obtained Independence in 1947, there were a total of about 300 dams. During the next twenty years, there has been a spurt in the dam construction activity in which 695 dams were added bringing the total number of dams to nearly 1000 up to the year The dam building activity intensified during the next two decades and at the end of 1990 the total number of Indian dams stood at 3244 without accounting for 236 number of dams for which the year of construction is not available. Due to dwindling economy only 115 dams could be added after 1990 and today about 695 dams are at various stages of construction. As per the National Register of Large dams, India has as on today 4291 large dams including the 695 dams under construction. Distribution of large dams in India according to the age is given in Table 2.1. Table 2.1 Distribution of large dams according to age. Year of Completion Up to & above 116 Year of constr. Not available 236 -do- -do- No. of dams

12 World Commission on Dams. 6 Under construction 695 Total : 4,291 Source: CBI&P Table 2.2 gives the Statewise distribution of dams, according to different types and Table 2.3 shows distribution of dams in different States of India, according to the purpose of reservoir. A close examination of the data presented in the Tables indicate the following:! Darn building activities have been in practice in India since many centuries, mainly for the purpose of irrigation and domestic use.! Due to non-availability of systematic records, details regarding a number of ancient dams could not be known.! Fillip for dam building activity was given when the Five-Year Plans started in and about 700 dams were added in the next two decades. This activity got intensified further and more than 2000 dams were completed during , after which the dam building activity moved with slow space mainly due to global economic crunch. Today about 700 dams which were commenced many years back are in various stages of construction.! The total existing large dams comprises of more than 89% of earth dams, concrete / masonry gravity dams little less than 5% and composite dams little over 5%. The States of Maharashtra and Madhya Pradesh have taken a leap followed by the States of Gujarat, Karnataka, Andhra Pradesh, Orissa, Uttar Pradesh, Tamil Nadu and Bihar in that order. Table 2.2 Statewise Distribution of Dams under Different Categories Sl. No. State Total TE (Earth) ER (Rockfill) (Masonry) PG TE/PG Composite Remarks 1. Andhra Pradesh Arunachal Assam Bihar Goa Gujarat TNK=2 7. Himachal Pradesh TYPE 2-8. Jammu & Kashmir Karnataka TNK=3 10. Kerala ARCH Madhya Pradesh TYPE Maharashtra Manipur Meghalaya Orissa Punjab Rajasthan TNK=5 18. Tamil Nadu Tripura Uttar Pradesh TNK=Type 21. West Bengal not known Total : Source:CBI&P

13 World Commission on Dams. 7 Table 2.3: Statewise Distribution of Dams by Function Sl. State Type of Dam No. I I/S I/H S H S/H TNK* 1. Andhra Pradesh Arunachal Assam Bihar Goa Gujarat Himachal Pradesh Jammu & Kashmir Karnataka Kerala Madhya Pradesh Maharashtra Manipur Meghalaya Orissa Punjab Rajasthan Tamil Nadu Tripura Uttar Pradesh West Bengal Total : Source: CBI&P * Type not known. The analysis further reveals that more than 92% of the dams built in India serve solely the purpose of irrigation, 2.2% hydroelectric power generation, less than 1% water supply and less than 35% serve a combination of multi-purpose of irrigation, water supply and hydropower generation. Table 2.4 gives the details of dams of height 100 m and above. Idukki dam is the only concrete arch dam in India, having a height of 169m standing across Periyar River in the State of Kerala. These dams have created a total live storage capacity of 177 km 3 by 1995 as against km 3 in the pre-plan period. Besides, dams to create an additional live storage capacity of 75 km 3 are under various stages of construction. Also dams under formulation/consideration will create an additional live storage of 132 km 3. When all the dams under construction and those under consideration are completed, India would have created a total live storage of 384 km 3, which is less than 56% of assessed utilisable surface water resources of 690 km 3. By the year 2025, the country s water requirement has been projected as 1050 km 3, the share of surface water being 700 km 3, which would necessitate construction of large capacity reservoirs in addition to those presently under construction and formulation. If such a programme is to be accomplished, solutions to the administrative and environmental problems which, have dampened the spirit and slowed down further development, are also required to be found urgently in the right earnest. 2.2 CONCLUSION An examination of available statistics reveals that increase in production has closely followed the creation of surface storages which clearly indicates the necessity for not-only sustaining the potential created so far but the need for creating additional storages. Available statistics also indicates that the vast hydroelectric power potential available needs to be developed if industrial and domestic energy requirement have to be met with. All out efforts are required to develop all the resources available to

14 World Commission on Dams. 8 meet the demand due to increasing population and consequent requirement for increased food and fibre as well as electricity. The presently existing hydro thermal-ratio of 25 : 75 has to be brought to the accepted norm of 40 : 60. Hydropower cannot be developed without creating storages by building high dams/large capacity reservoirs. Creation of storages and development of surface irrigation and hydropower development are also beset with associated problems like environmental degradation water logging, loss of capacity due to siltation etc. but they have to be attended to pari pasu the development progrannnes instead of advocating total stoppage of the development works. During the last five decades since independence, India has achieved a spectacular development of water resources, in respect of irrigation and hydropower. Drought-famine syndrome is eliminated to a large extent and the rain-floods syndrome is reduced considerably. Over one-third of flood prone area has been protected. Irrigated area and food grain production has gone up by four times. Safe drinking water is assured most part of Country except in problem villages. Over a tenth of irrigation potential created is unutilised. Problems of water logging and low productivity need to be tackled. Ground water development needs to be given due attention. Water resources development is facing a serious crisis and uncertain future. Plan investment has also come down drastically. Continuance of sustainable water resources development at a fast pace is imperative for the very survival of the Nation. The political and bureaucratic set-up need to ponder and give fresh impetus and may be a course correction to accelerate about 700 on-going projects which have been held up for want of funds. This is very essential in view of the rapidly growing population and rising demand for water from various competing Sectors. This reality has also to realise the growing public resistance against such activity (Appendix-I). Table 2.4: Dams above 100 metre height Sl. Name of Dam Year of State in Type Height Length VolumeGross Effective Design No. completion which above of dam content capacity capacity purpose located found M 10 3 m m m 3 1. Idamalayar 1985 Kerala PG Karjan (Lower) U/C Gujarat TE/PG , Kulamavu* 1977 Kerala TE Supa 1987 Karnataka TE , Koyna 1964 Maharastra TE/PG ,000 H 6. Sholayar 1971 Tamil Nadu PG , Salal (Concrete J&K PG I/H Dam) 8. Kakki* 1966 Kerala PG H 9. Salal (Rockfill 1986 J&K TE/ER H Dam) 10. Nagarjuna Sagar 1960 Andhra TE/PG ,000 I/H Pradesh 11. Ramganga 1974 Uttar PradeshTE ,770 I/H 12. Pong Dam 1974 Himachal TE ,000 I/H Pradesh 13. Cheruthoni 1976 Kerala PG ,430 H 14. Jamrani 1990 Uttar PradeshTE ,600 I/H 15. Chamera 1994 Himachal TE ,650 H Pradesh 16. Srisailam 1984 Andhra PG ,000 H Pradesh 17. Idukk Kerala TE ,430 H 18. Lakhwar U/C Uttar PradeshTE ,000 I

15 World Commission on Dams Bhakkra Dam 1963 Himachal TE ,000 I/H Pradesh 20. Kishau U/C Uttar PradeshPG ,000 I/H 21. Tehri U/C Uttar PradeshTE ,000 I/H Source:CBI&P 2.3 Completion of Pending Works Vs Starting New In view of foregoing starting new dams in place of ongoing projects would not arise due to following reasons:! Growing local public resistance.! Sagging fund flow from financial institutions. As rightly reported in Economist of November th 1999 the flow of aid money is drying up. Since big dams are so controversial, even the World Bank, once the biggest force behind big dams, has grown skittish. Achim Steiner, the secretary-general of the WCD, which was created by governments, development agencies and non-governmental organisations, notes that even Asia s zealous builders of big dams are being pulled into global principles by market forces. This is because they face a squeeze from both private and public investors. The decline in aid money raises the costs of financing. And the inevitable protests and legal wrangles facing such projects add financial risk, which translates into higher costs. Another blow is the continuing deregulation of the global power industry, which shifts financing to the private sector and so to low-risk projects with quick returns. That means away from big dams and towards gas-fired plants. And the locals are growing in importance. In India, for example, pressure from grassroots organisations is forcing the government to scale back its plans for the Narmada valley. The number of dams is sure to be cut and the heights of those remaining reduced; many will also be redesigned to reduce their social and environmental impact feels Smitu Kothari of Lokayan, a social think tank at Delhi. Private sector participation involves not only the private corporate sector but also groups like farmers organisations, voluntary bodies and the general public. About 90-95% of ground water development is by private efforts either through own financing or institutional financing or both. However in the case of surface water, especially major and medium projects, all the irrigation projects are not equally endowed with the potential for privatisation and, as such, identification of projects as a whole or partially (i.e. planning and investigation, construction, operation and management financing and maintenance etc.) may have to be undertaken in the light of its viability vis-à-vis various privatisation options as available with hydel power generation and recreation, etc. along with irrigation, the viability for privatisation of a project improves. 2.4 Private Sector Participation Some states like Maharashtra, Madhya Pradesh and Andhra Pradesh have initiated the action for privatisation of irrigation projects. These projects are envisaged for privatisation on Build-Own- Operate (BOO), or Build-Own-Operate-Transfer (BOOT) or Build-Own-Lease (BOL) basis. In the case projects on BOO basis, the Irrigation Department may buy water in bulk from the agency at mutually agreed price for distribution to the farmers. Apart from this, Maharashtra Krishna Valley development Corporation (MKVDC) for Krishna Valley Projects, Sardar Sarovar Narmada Nigam Ltd. (SSNNL) for Sardar Sarovar Project in Gujarat and Jal Bhagya Nigam for Upper Krishna Project, Karnataka have mobilised financial resources through issue of Public Bonds from the private market.

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